Update comments.

src/sync-servers/network-sync-server.ts

@@ -8,7 +8,10 @@ import {TcpSyncServer} from './tcp-sync-server';
 /** HotSync port to listen on. */
 export const NET_SYNC_PORT = 14238;
 
-/** Network HotSync server. */
+/** Sync server for network HotSync connections.
+ *
+ * Only available in Node.js.
+ */
 export class NetworkSyncServer extends TcpSyncServer<NetSyncConnection> {
   connectionType = NetSyncConnection;
   port = NET_SYNC_PORT;

src/sync-servers/serial-over-network-sync-server.ts

@@ -17,7 +17,11 @@ import {TcpSyncServer} from './tcp-sync-server';
  */
 export const SERIAL_NETWORK_SYNC_PORT = 6416;
 
-/** Serial-over-network HotSync server for use with Palm OS emulators. */
+/** Sync server for serial-over-network connections, primarily for use with Palm
+ * OS emulators such as POSE.
+ *
+ * Only available in Node.js.
+ */
 export class SerialOverNetworkSyncServer extends TcpSyncServer<SerialSyncConnection> {
   connectionType = SerialSyncConnection;
   port = SERIAL_NETWORK_SYNC_PORT;

src/sync-servers/serial-sync-server.ts

@@ -13,7 +13,10 @@ import {
 } from '../protocols/sync-connections';
 import {SyncFn, SyncServer} from './sync-server';
 
-/** Sync server using a serial port. */
+/** Sync server for serial connections.
+ *
+ * Only available in Node.js.
+ */
 export class SerialSyncServer extends SyncServer {
   constructor(
     /** Serial port device to listen on. */

src/sync-servers/tcp-sync-server.ts

@@ -8,7 +8,7 @@ import {
 import {Duplex} from 'stream';
 import {SyncServer} from './sync-server';
 
-/** Base class  sync servers that communicate over TCP/IP. */
+/** Base class for sync servers that communicate over TCP/IP. */
 export abstract class TcpSyncServer<
   SyncConnectionT extends SyncConnection,
 > extends SyncServer {

src/sync-servers/usb-sync-server.ts

@@ -235,6 +235,10 @@ export class UsbConnectionStream extends Duplex {
 /** USB device polling interval used in waitForDevice(). */
 const USB_DEVICE_POLLING_INTERVAL_MS = 200;
 
+/** Sync server for USB connections.
+ *
+ * Available both in Node.js and the browser.
+ */
 export class UsbSyncServer extends SyncServer {
   override async start() {
     if (this.runPromise) {

src/sync-servers/web-serial-sync-server.ts

@@ -85,6 +85,10 @@ export class WebSerialStream extends Duplex {
   private shouldClose = false;
 }
 
+/** Sync server for Web Serial API connections.
+ *
+ * Only available in the browser.
+ */
 export class WebSerialSyncServer extends SyncServer {
   constructor(
     /** HotSync logic to run when a connection is made. */